Diaphragm pump



FIG. 1 is a top perspective view of a diaphragm pump showing our new design;

FIG. 2 is a side view;

FIG. 3 is a side view showing the opposite side of FIG. 2;

FIG. 4 is a front view;

FIG. 5 is a back view;

FIG. 6 is top view; and,

FIG. 7 is a bottom view.

The broken line showing in FIGS. 4 and 5 is included for the purpose of illustrating environmental matter and forms no part of the claimed design. 

We claim the ornamental design of a diaphragm pump, as shown and described herein. 